FIELD CROPS. 



967 



seedlings killed in . ' normal hydrochloric acid excreted material rich in potassium, 

 and those groTi o in distilled water also excreted potash or some other alkali. 



Since the amount of acid in solutions in which the seedlings were grown was 

 reduced, it is believed thai fche death was caused by chemical action; and since the 

 killed radicles contained less potassium than the normal ones and the solution in 

 which they were killed was rich in potassium, it is thoughl thai this chemical action 

 takes place between the acid of the solution and the potassium of the radicle. The 

 behavior of bacteria and fungi in the solutions is taken as suggesting that the excre- 

 tions or extractions caused by the acid solutions mighl be some organic compound 

 especially nutritious to these organisms. 



Cotton growing in Australia, .1. Bottomley {Melbourne: Mason, Firth, & 

 McCutcheon [ 1905 \, pp. ?4,figs. 17).- This is a discussion on cotton growing in Aus- 

 tralia, with special reference to a variety originated by crossing a cotton from the 

 upper Amazon region and one from Mexico, both of the Sea Island type. This 

 variety is known as Caravonica, and is described as having a staple very long, Btrong, 

 and regular and of woolly appearance. 



Cooperative potato experiments, 1904, M. Weibull i;i ai. [Mdlmo. Ldns K. 

 Hushall. Sallsk. Kvrtlsskr., 1905, No. t, pp. 161-206). — Experiments with L5 varieties 

 of potatoes were conducted on 5 farms. 



The highest average yields of tubers for the leading varieties were as follows: 

 Professor Maercker l'">o, Geheimral Thiel 247, and LJp-to-Date 237 hectoliters per 

 hectare. In starch content Fiirst Bismarck led with 22.1 percent, followed by Pro- 

 fessor Wohltmann with 20.6 and Bund <\c\- Landwirte with 20.3 per cent. The lead- 

 ing varieties in the production of starch per hectare were Professor Maercker, 

 Geheimral Thiel, and Silesia, producing 3,570, 3,440, and 3,150 kg., respectively. 



Fertilizer tests were carried on with 4 varieties on 20 different farms. Halt the 

 number of plats received no manure, while the remaining plats received 250 kg. each 

 of nitrate of soda, 20 per cent superphosphate, and 37 percent potash sail per hec- 

 tare, with the exception of certain plats manured in the tall of 1903, which were 



given 100 kg. less of nitrate of soda and 50 kg. less of superphosphate and potash 

 salt. The results are shown in the following table: 



Influence of commercial fertilizers on yield and starch content of potatoes. 



V. W. W'ol.l.. 



Cooperative potato experiments, 1904, H. Juhlin-Dannpelt and S. Rhodin 

 ( A\ Landibr. Akad. Handl. och Tidskr., 44 {1905), No. P, pp. 105-154). — Variety and 



fertilizer tests were made. Fifteen varieties were grown on 62 farms in different parts 

 of Sweden. The largest average yields were secured from Paulsen Rothauge, Up-to- 

 Date, Leksand, Mossros, Jamtland, and Cimbal President Kruger. Agnelli, Dol- 

 kowsky Topas, Leksand, Paulsen Rothauge, .hunt land, and l'p-to-I >ate. in the order 

 given, produced the largest yields of starch. — v. w. woll. 



The sprouting of seed potatoes, R. B. Greig - Aberdeen and No. of Scot. Col. 

 Agr. Bui. • >'. pp. 9). — Experiments with sprouted seed potatoes were conducted on 9 



31080— Xo. 10—06 4 



